dengziming commented on code in PR #12315: URL: https://github.com/apache/kafka/pull/12315#discussion_r905758022
########## core/src/main/scala/kafka/tools/MetadataShellTool.scala: ########## @@ -0,0 +1,199 @@ +/** + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package kafka.tools + +import java.nio.file.{Files, Path} +import java.util.Collections +import java.util.concurrent.CompletableFuture +import kafka.raft.KafkaRaftManager +import kafka.server.{KafkaConfig, KafkaRaftServer, MetaProperties} +import kafka.utils.Logging +import net.sourceforge.argparse4j.ArgumentParsers +import org.apache.kafka.common.metrics.Metrics +import org.apache.kafka.common.utils.{Exit, Time, Utils} +import org.apache.kafka.metadata.MetadataRecordSerde +import org.apache.kafka.metadata.util.{ClusterMetadataSource, SnapshotFileReader} +import org.apache.kafka.raft.{BatchReader, KafkaRaftClient, LeaderAndEpoch, RaftClient, RaftConfig} +import org.apache.kafka.server.common.ApiMessageAndVersion +import org.apache.kafka.shell.{InteractiveShell, NonInteractiveShell} +import org.apache.kafka.snapshot.SnapshotReader + + +object MetadataShellTool { + def main(args: Array[String]): Unit = { + val parser = ArgumentParsers.newArgumentParser("metadata-tool"). + defaultHelp(true). + description("The Apache Kafka metadata tool") + parser.addArgument("--cluster-id", "-t"). + `type`(classOf[String]). + help("The cluster id. Required when using --controllers") + val accessGroup = parser.addMutuallyExclusiveGroup(). + required(true) + accessGroup.addArgument("--snapshot", "-s"). + `type`(classOf[String]). + help("The snapshot file to read.") + accessGroup.addArgument("--controllers", "-q"). + `type`(classOf[String]). + help(s"The ${RaftConfig.QUORUM_VOTERS_CONFIG}.") + parser.addArgument("command"). + nargs("*"). + help("The command to run.") + val res = parser.parseArgsOrFail(args) + val source = if (res.getString("snapshot") != null) { + new SnapshotFileReader(res.getString("snapshot")) + } else if (res.getString("controllers") != null) { + val clusterId = res.getString("cluster_id") + if (clusterId == null || clusterId.isEmpty) { + throw new RuntimeException("You must provide --cluster-id when connecting " + + "directly to the controllers.") + } + val observer = new MetadataShellObserver() + observer.setup(res.getString("controllers"), clusterId) + observer + } else { + throw new RuntimeException("You must set either --snapshot or --controllers") + } + try { + val args = Option(res.getList[String]("command")).getOrElse(Collections.emptyList[String]) + if (args.isEmpty) { + val shell = new InteractiveShell(source) + try { + shell.run() + } finally { + shell.close() + } + } else { + val shell = new NonInteractiveShell(source) + try { + shell.run(System.out, args) + } finally { + shell.close() + } + } + Exit.exit(0) + } catch { + case e: Throwable => + System.err.println("Unexpected error: " + (if (e.getMessage == null) "" + else e.getMessage)) + e.printStackTrace(System.err) + Exit.exit(1) + } + } +} + +class HighWaterMarkTrackingRaftClientListener( + val caughtUpFuture: CompletableFuture[Void], + val raftClient: KafkaRaftClient[ApiMessageAndVersion], + val underlying: RaftClient.Listener[ApiMessageAndVersion], +) extends RaftClient.Listener[ApiMessageAndVersion] { + override def handleCommit(reader: BatchReader[ApiMessageAndVersion]): Unit = { + reader.lastOffset().ifPresent(checkIfCaughtUp(_)) + underlying.handleCommit(reader) + } + + override def handleSnapshot(reader: SnapshotReader[ApiMessageAndVersion]): Unit = { + checkIfCaughtUp(reader.lastContainedLogOffset()) + underlying.handleSnapshot(reader) + } + + override def handleLeaderChange(leader: LeaderAndEpoch): Unit = { + underlying.handleLeaderChange(leader) + } + + override def beginShutdown(): Unit = { + underlying.beginShutdown() + } + + private def checkIfCaughtUp(offset: Long): Unit = { + if (!caughtUpFuture.isDone) { + raftClient.highWatermark().ifPresent(highWatermark => + if (offset >= highWatermark) { + caughtUpFuture.complete(null) + }) + } + } +} + +class MetadataShellObserver extends ClusterMetadataSource with Logging { + val _caughtUpFuture = new CompletableFuture[Void]() + var tempDir: Path = null + var raftManager: KafkaRaftManager[ApiMessageAndVersion] = null + var _listener: HighWaterMarkTrackingRaftClientListener = null + + def setup( + quorumVoters: String, + clusterId: String + ): Unit = { + try { + tempDir = Files.createTempDirectory("MetadataShell") + val metaProperties = new MetaProperties(clusterId, -1) + val configMap = new java.util.HashMap[String, Object] + configMap.put(RaftConfig.QUORUM_VOTERS_CONFIG, quorumVoters) + configMap.put(KafkaConfig.MetadataLogDirProp, tempDir.toAbsolutePath.toString) + val config = new KafkaConfig(configMap) Review Comment: We should set `process.roles` here to avoid exception -- This is an automated message from the Apache Git Service. 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